Combined heating apparatus.



PATENTED AUG. 16, 1904.

W. H. DENSLOW. COMBINED HEATING APPARATUS.

APPLICATION FILED NOV. 18. 1903. N0 MODEL. 3 SHEETS-SHEET 1.

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m 1 1| 44 r 35 3? 43 I 40 2 37 H v 26' 95 I Qmmw No. 767,874. PATENTED AUG. 16, 1904.

W. H. DENSLOW. COMBINED HEATING APPARATUS.

APPLICATION FILED NOV. 18, 1903.

N0 MODEL. 7 3 SHEETS-SHEET 2.

37wufoz 17/ /'0 f1? 15/. ,0 6/7 3/0 ea. Witnesses PATENTED AUG. 16, 1904.

W. H. DENSLOW.

COMBINED HEATING APPARATUS;

APPLIGATION FILED NOV. 18, 1903.

3 SHEETS-SHEET 3.

NO MODEL.

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UNITED STATES Patented August 16, 1904.

PATENT OFFICE.

COMBINED HEATING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 767,874, dated. August 16, 1904. Application filed November 18, 1903. Serial No. 181,694.. (No model.)

To all -zuh07n it petty concern:

Be it known that 1, WILLIAM H. DENSLOW, a citizen of the United States, residing at WVaverly, in the county of Tioga and State of New York, have invented new and useful Improvements in a Combined Heating Apparatus, of which the following is a specification.

This invention relates to a combined steam and hot-air heater; and it consists in the construction and arrangement of parts which will be more fully hereinafter described and claimed and constituting improvements on the structure disclosed by Letters Patent of the United States granted me February 10, 1891, No. 446,163.

The primary object of the present improve ment is to utilize the products of combustion with the greatest economy by increasing the heating-surface within minimum confines, and

features of the invention. Fig. 2 is an enlarged detail section through the lower extremity of one of the water-tubes. Fig. 3 is a section on the line 7 7-, Fig. 2. Fig. 4c is a front elevation of the system of .water tubes and means for supporting the same, showing the arrangement of such tubes in relation to the fines and the differentiation in the length of a portion thereof to form a feeding chute or opening for the introduction of coal or other fuel into the fire-pot of the furnace. Fig. 5 is a horizontal section on the line 10 10, Fig. 4, looking in the direction of the arrow.

Similar numerals of reference are employed to indicate corresponding parts in the several views.

The numeral 1 designates a base of suitable contour and having an opening 2 therethrough and supporting a fire-pot 3 and ash-pit structures 4:, included in the lower portion of the heater. A grate 5 of any suitable form is disposed in the upper portion of the ash-pit at the base of the fire-pot, and from said ash-pit a conduit 6 extends outwardly to a door 7, covering an opening 8 in the lower extremity of an outer casing 9, constructed of sheet metal, as usual, and having a top closure 10 and hot-air outlets 11, to which pipes or conduits may be attached and extend away from the heater in any direction desired. A shaker rod or bar 12 from the grate 5 extends lengthwise within the conduit 6 and is accessible through the door '7, the latter being supported .by a suitable frame well known in heater construction, and the ashes from the pit 4 may also be removed through the conduit and the door 7. The fire-pot 3 is strengthened by a series of external ribs 13, which increase in outward extent toward the upper extremity of said pot, where a flange or outwardly-projecting ledge 14 is formed, and on the said flange a mud-ring 15 is disposed and has a water-feeding pipe 16 attached thereto and adapted to pass through the outer casing 9 and connect with any suitable source of water-supply. At an opposite point the mudring 15 has a mud blow-off 17 attached thereto and consists of adownwardly-inclined pipe 18, projecting through the casing 9 and terminating in a'depending elbow 19, attached to the upper portion of a spherical chamber 20, having a lower removable plug 21. The interior diameter of the mud-ring 15 is precisely similar to the interior diameter of the fire-pot 3' to avoid obstruction to the upward movement of the heated air-currents and products of combustion. Held on the ledge 14 exteriorly of the outer edge of the mudring 15 is a sheet-metal casing 22 of cylindrical form and supporting on its upper end aring 23, having an inner depending flange 24, within which is mounted a crown-plate 25. The cylindrical casing 22, in conjunction with the head -ring 23 and crown-plate 25, forms over the fire proper what may be termed a heatingechamber, and leading therefrour is a downwardly-inclincd chute 26, communieating at its outer terminal with a frame and door 27 of suitable construction and attached to the casing 9. It will be understood that a suitable opening will be formed in the cylindrical casing 22 at the point where the inner end of-the chute is attached thereto to permit fuel to be introduced into the heater and pass down through the mud-ring 15 into the firepot. On the ring 23 a dome or cap 28 is arranged and has an outwardly-1)rojecting baseflange 29, bearing on a similar flange of the ring 23.

The crown-plate 25 is fitted within the depending flange 24 in any preferred manner which will result in the production of a water-tight joint. Depending from the crownplate 25 are a series of water-tubes 35, having lower tapered or enlarged conical ends 36, which are arranged in close relation and at the center are gradually shortened, so as to form a clear space in line with the chute 26 to permit the introduction of fuel into the fire-pot 3. At regular intervals the mud-ring 1'5 and crown-plate 25 are connected by vertical supply-pipes 37, the ends of said pipes opening through the respective parts to which they are attached. The cylindrical casing 22, dome 28, mud-ring 15, tubes 35, and connecting-pipes 37 constitute a boiler, and included in the boiler organization is a steam-dome 38, disposed centrally of the top of the dome 28 and having a depending pipe or nipple 39, extending into the upper portion of thedome 28. The steam-dome 38 is concentrically surrounded by a smoke-ring 10, and communieating therewith are a series of smoke-conveying pipes 41. arranged vertically in the dome 28 and having their opposite ends respectively opening through the top of the dome into the smoke-ring and through the crown-plate 25 to permit the smoke and prodnets of combustion passing upwardly through the heating-chamber formed by the cylindrical casing 22 to escape into the smoke-ring 4:0 and. be conveyed from the latter by any suitable means. Attached to the top of the steam-dome 38 is a steam-conveying pipe 12, and said dome is also provided with a pressure-indicating attachment consisting of a pipe 13 and a gage 14.

The Water-tubes 35 are closely assembled between the pipes 37 and produce a materiallyextended heatingsurface within minimum confines, and the caloric of the heated-air currents and products of combustion rising from the fire-pot and passing upwardly through the cylindrical casing 22 become practically utilized with material advantage before they are allowed to escape through the pipes 41 into the smoke-ring 40. By this means the ordinary amount of fuel required to be used in a furnace is utilized to a greater advantage in rapidly producing steam. What heat may remain in the products of combustion passing upwardly through the cylindrical casing 22 will advantageously affect the Water contained within the dome 28, and it will be seen that the water passing through the pipes 37 into the dome is in a heated condition in view of the closeness of the ring 15 to the source of heat and the exposure of the pipes 37 to the heat within the casing 22. It will also be understood that a suitable Water-gage Will be attached -to the boiler, including the parts heretofore explained.

The pipe 16 has heretofore been described as a water-supply pipe; but it will be understood that the same will connect with the return-pipe from the radiators to permit the water of condensation to flow back into the said ring.

The boiler as thus far described is simple in its operation, the Water entering the ring 15, passing upwardly through the pipes 37 into the dome 28, and from the latter circulating in the tubes 35. The great number of tubes 35 used will expose reduced quantities of Water to the effect of the heat in the chamber provided by the casing 22, and the circulation of the water will be materially increased and avoid the congregation of sediment within the several tubes. The steam formed will pass up into the dome 38 and from the latter be conveyed to the radiators by a suitable pipe system. The sediment that may be carried by the water entering the ring Will be flushed out into the trap 17, and the sediment from the dome 28 will also gravitate through the pipes 37 into the ring 15 and be relieved from the latter by the Water infiowing thereinto. As before indicated, the proximity of the several water-tubes 35 insures utilization of the full heating effect of the products of combustion, in View of the fact that a direct outflow through the pipes 11 is obstructed by the provision of small spaces or passages between the several water-tubes.

A further advantage in the construction of furnace as set forth is its compactness and reduced proportions, which will permit a disposition thereof within varying vertical elevations without requiring a reorganization of The improved boiler also includes certain details of structure, as shown by Fig. 4E. The most important of these additions is in the construction of the water-tubes 35 and consists in dividing each of the same into two chambers 45 and 4:6 by a resilient partition 47, which is bent intoS shape and extends downwardly through the tube to the tapered or inverted conical lower terminal 36. The partition 47 is held in place in the tube solely by frictional contact of the terminals thereof against the inner surface of said tube, and thereby avoid the use of rivets or fastenings for holding the partition in place and the disadvantage of rusting out and leakage at the points where fastenings are used in connection with water-tubes. Another advantage in disposing the partition 47 in the tube as set forth is that, if found necessary, the said partition can be easily withdrawn and replaced by another of a similar construction. The division of each tube in a vertical direction by a partition, as set forth, permits the water to pass down through one chamber and upwardly through the other, thereby establishing a regular circulation, and as a material auxiliary in causing a regularity in the circulation of the water in each tube the lower tapered or inverted conical end 36 is employed and serves as a deflecting means to throw the water coming down through one chamber upwardly through the other. In the series of tubes shown the downward movement of the water may take place in the chambers 46 or a portion thereof and pass upwardly through the chambers 45, as indicatedby the arrow in Fig. 2, or the converse may be true and the water pass downwardly through the chambers 4:5 and upwardly through the chambers 46. The partitions 47 in the several tubes encourage the institution of a rapid circulation and materially reduce the time required to form steam.

It will be understood that an air-flue will be connected with the heater, as set forth, as usual in hot-air heating constructions, and, as shown in Fig. 1, a pipe or conduit 60 enters the base plate or ring 1. This pipe or conduit 60 will be provided with a suitable damper to control the flow of air into the casing around the heater proper, and it will be understood that, as in usual hot-air heaters, the incoming air will be fully heated before rising to the top of the inclosure or outer casing 9.

Changes in the proportions, dimensions, and minor details of the several parts may be resorted to without departing from the spirit of the invention.

Having thus fully described the invention, what is claimed as new is 7 1. A heater of the class set forth, having a fire-pot, a mud-ring disposed in the fire-pot, a

boiler held on the fire-pot and inclosing the ring, said boiler including an upper dome having pipe connections with the mud-ring and depending water-tubes, flues extending upwardly through the dome, a smoke-ring on the dome with which the fines connect, and a steam-dome within the confines of the smokering.

2. A heater of the class set forth, having a lower heating means, a mud-ring disposed on the said means and serving as a water-supply receptacle, a casing held on the heating means and inclosing the said ring, the ring being opened to permit the products of combustion to rise within the casing, a dome disposed on the upper end of the casing, a crown-plate secured to the lower part of the casing and having a series of water-tubes depending therefrom and communicating with the dome, the water-tubes being formed with lower closed ends, pipes connecting the ring and dome, flues opening through the crown-plate and the top of the dome, a smoke-ring arranged on the top of the dome, and a steam-dome centrally disposed in the smoke-ring and communicating with the first-mentioned dome.

3. A heater of the class set forth having a lower heating means, a mud-ring supported on the heating means and providing a waterchamber, a boiler arranged on the heating means and inclosing the mud ring, a pipe connecting with the ring to permit water to run thereinto, a downwardly-inclined pipe also attached to the ring and having a depending extremity, and a spherical chamber attached to the said depending extremity, the downwardly-inclined pipe with its depending extremity and the spherical chamber forming a mud blow-off means.

4:. A heater of the class set forth, having a lower heating means, a water-receiving device disposed on the said means and having an opening through the center thereof, aboiler arranged on the means and inclosing the \va-' ter-receiving device, said boiler including an upper dome with fines therethrough, a crownplate, pipes connecting the water-receiving device and dome, a plurality of water-tubes depending from the crown-plate and having lower closed ends terminating abovethe water-receiving device, the said tubes at the center being gradually shortened to form a fuelpassage, and a casing surrounding the tube, an outer casing, and a fuel-chute connecting the outer and boiler casings, and opening into the fuel-space formed by shortening the water-tubes at the center.

5. A heater of the class set forth, having water-tubes depending thereinto and formed with lower tapered closed ends, and divisional partitions inserted in the said tubes and consisting of spring-metal strips of S-shaped form frictionally held at their ends and readily insertible in and removable from the said shaped resilient partitions removablymount- I tubes. ed therein and held in place solely by fric- 6. A heater having water-tubes with lower tional contact With the device. inverted conical closed ends, and S-shaped rein testimony whereof I aflix my signaturein silient partitions frietionally held within the presence of tWo Witnesses. tubes and terminating at their lower ends at WILLIAM H. DEN SLON. the upper portions of the said closed ends of WVitnesses:

the tubes. JOHN L. FLETCHER,

7. A heater, having Water-tubes with S- CHAS. S. HYER. 

